Casper had thought that Keith might capture some part of him in the whip, but the electricity caught him completely off guard. Though his claws found their mark, the electricity coursing through him caused him to howl in pain, and he was too dazed from it to avoid having his face bashed by Keith's knee. He glared intensely up at the man, his eyes locked onto the man's eyes while he held his nose, which was bleeding. A low snarl came from his throat and he spat at Keith, all of his good humor seeming to have been jolted out of him with the electricity. He was now out for blood. 

"You're going to regret that, you maggot!" His eyes were full of hate now, but his mind was still sharp as ever. He dodged the katana and whip strikes, his movements even more catlike as he was now completely on all fours, his shoulders hunched and his legs bent at an almost unnatural angle, his eyes still focused on the target before him. Suddenly, as Keith came towards him, he was no longer where he'd been a moment ago, the katana and Keith's full weight crashing into the space he'd left, as he'd seemingly disappeared the split second before the katana and whip would have rended his flesh. Those watching would have noticed a moment later that he was now behind Keith, his teeth bared as he leapt on the man's back, his claws seeking to dig into the man's flesh and tear at it.